Why Biphasic Symmetrical Waveform Matters in TENS/EMS Therapy

Biphasic symmetrical waveforms are widely regarded as the most effective, comfortable, and safe stimulation pattern for both TENS (Transcutaneous Electrical Nerve Stimulation) and EMS (Electrical Muscle Stimulation) therapies.

Comfort and Skin Safety

This waveform type delivers equal positive and negative pulses, creating a zero net electrical charge. This balance minimizes skin irritation and eliminates the risk of chemical burns commonly associated with unbalanced or monophasic currents.

Source: Lane Community College - Foundations of E-Stim

Clinically Safe for Long-Term Use

Biphasic symmetrical waveforms are charge-balanced and polarity-reversing, making them ideal for prolonged or repeated use. This reduces risk of tissue damage or nerve desensitization.

Source: Anatomical Concepts – Electrical Stimulation Overview

Comparable Pain Relief Effectiveness

While waveform shape impacts comfort, clinical studies show no significant difference in analgesic outcomes between symmetric and asymmetric biphasic TENS. The choice mainly affects skin tolerance and user preference.

Source: ResearchGate – TENS Waveform Study in Rats

Summary

• Biphasic symmetrical waveforms = zero net charge = lower skin irritation risk
• More comfortable than monophasic or polyphasic waveforms
• Ideal for large muscle groups and sensitive users
• Delivers consistent results with minimal side effects

That’s why all Levina devices are designed with clinically trusted biphasic symmetrical stimulation—engineered for comfort, safety, and results.